Chrysler's Tc (Maserati) Service Manual #81-270-9050
M MULTI-POINT FUEL INJECTION 14-27hold position. The SMEC will monitor that system test and results will be displayed. Using the test summary chart, the display number must be adjusted as indicated for that test.
Code Description 61 Battery temperature sensor-display number divided by 10 equals volts. 62 Oxygen sensor-display number - 10 equals volts. 63 Intake charge temperature sensor-display number divided by 10 equals volts. 64 Engine coolant temperature sensor-display number x 10 equals degrees F. 65 Throttle position sensor-display number divided by 10 equals volts. 67 Battery voltage sensor-display is volts. 68 Manifold vacuum/pressure sensor-display is inches (Hg) PSIg. 69 Minimum throttle position sensor-display number divided by 10 equals volts. 70 Minimum airflow idle speed sensor-display number x 10 equals volts. 71 Vehicle speed sensor-display is mph. 72 Engine speed sensor-display number divided by 10 equals rpm.
Throttle Body Minimum Air Flow Check Procedure
(1) Warm engine in Park or Neutral until the cooling fan has cycled on and off at least once.
(2) Hook-up timing check device and Tachometer.
(3) Disconnect the coolant temperature sensor and set basic timing to 12~ BTDC +/- 2~ BTDC.
(4) Shut off engine.
(5) Disconnect 3/16" manifold vacuum purge line from the top of the throttle body. Cap the 3/16" throttle body nipple.
(6) Connect Diagnostic Readout Box II (DRBII).
(7) Restart the engine, allow engine to idle for at least one minute.
(8) Using the DRBII, access Min. Airflow Idle Spd. The following will then occur:
- AIS motor will fully close.
- Idle spark advance will become fixed.
- Engine RPM will be displayed on Diagnostic Readout Box II (DRBII).
(9) Check idle RPM with tachometer, if idle RPM is within the below specification then the throttle body min. air flow is set correctly.
Odometer Reading (Below 1000 miles): 600-1100 rpm
(Above 1000 miles): 650-1100 rpm
If idle RPM is not within specification replace throttle body.
(10) Shut off engine.
(11) Remove DRBII.
(12) Disconnect timing check device and tachometer.
(13) Reconnect purge line to throttle body.
Ignition Timing Procedure Refer to Group 8D "Ignition System."
FIGURE 24 - 14-WAY (SMEC) CONNECTOR:
WIRING CONNECTOR PIN DESCRIPTION
14 Way Single Module Engine Controller (SMEC) Connector
Chrysler's TC (Maserati) Service Manual Publication # 81-270-9050 Revised TSB 18-05-89 April 3, 1989